JP7616242B2 - 方向性電磁鋼板の製造方法及び方向性電磁鋼板製造用圧延設備 - Google Patents
方向性電磁鋼板の製造方法及び方向性電磁鋼板製造用圧延設備 Download PDFInfo
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- JP7616242B2 JP7616242B2 JP2022571896A JP2022571896A JP7616242B2 JP 7616242 B2 JP7616242 B2 JP 7616242B2 JP 2022571896 A JP2022571896 A JP 2022571896A JP 2022571896 A JP2022571896 A JP 2022571896A JP 7616242 B2 JP7616242 B2 JP 7616242B2
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Description
鉄損のばらつきが改善されたメカニズムとしては、冷間圧延時ペイオフリールから払い出され1パス目に噛み込むまでに鋼板を加熱することにより、加熱してから1パス目に噛み込まれるまでの時間は一定となり、加熱により析出した微細カーバイドの経時変化が抑制できたためと考えられる。また、加熱後1パス目に噛み込ませる前に鋼板温度を低温にした場合に低鉄損となるメカニズムについては、以下のように考えられる。一次再結晶Goss方位粒は圧延安定方位の一つである{111}<112>マトリクス組織内に導入された剪断帯から核生成すると考えられている。
すなわち、前記実験で作製した熱延板に、1000℃×60秒の熱延板焼鈍を施し、次いで、800℃から350℃までの温度域を表2に示す種々の冷却速度で冷却した後、コイルに巻き取った。得られた熱延焼鈍板を、タンデム圧延機(ロール径300mm、スタンド数5)を用いて、1回のタンデム圧延にて0.20mmの板厚の冷延板とした。その際、圧延機のペイオフリールから1パス目の圧延スタンドの間に設置した鋼板加熱装置によって、鋼板を150℃まで加熱した。加熱後、5秒間で鋼板温度を室温(25℃)にしてから噛み込ませた。
これらの知見をもとにさらに検討を行い、本発明を完成させた。
[1]鋼素材を熱間圧延して熱延鋼板とし、前記熱延鋼板に1回又は中間焼鈍を挟む2回以上の冷間圧延を施して最終板厚を有する冷延板とし、次いで前記冷延板に脱炭焼鈍を施したのち二次再結晶焼鈍を施す、方向性電磁鋼板の製造方法であって、
前記1回又は2回以上の冷間圧延のうち、前記1回の場合は当該冷間圧延及び前記2回以上の場合は最終回の冷間圧延を最終冷延と定義し、前記最終冷延の直前に行う焼鈍を最終冷延前焼鈍と定義したとき、
前記最終冷延前焼鈍は、800℃以下350℃以上の温度域における平均冷却速度を20℃/s以上として行い、前記最終冷延は、タンデム圧延機を用いて、鋼板を70℃以上200℃以下の温度域に加熱した後10秒以内に60℃以下に冷却してから、前記タンデム圧延機の1パス目に導入する、方向性電磁鋼板の製造方法。
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100~0.0400%、
S:0.01~0.05%、
Se:0.01~0.05%、
S及びSeのいずれか1種又は2種の合計:0.01~0.05%、ならびに
N:0.0050~0.0120%
を含有し、残部がFe及び不可避的不純物の成分組成を有する、前記[1]に記載の方向性電磁鋼板の製造方法。
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100%未満、
S:0.0070%以下、
Se:0.0070%以下及び
N:0.0050%以下
を含有し、残部がFe及び不可避的不純物の成分組成を有する、前記[1]に記載の方向性電磁鋼板の製造方法。
Sb:0.005~0.500%、
Cu:0.01~1.50%、
P:0.005~0.500%、
Cr:0.01~1.50%、
Ni:0.005~1.500%、
Sn:0.01~0.50%、
Nb:0.0005~0.0100%、
Mo:0.01~0.50%、
B:0.0010~0.0070%及び
Bi:0.0005~0.0500%
からなる群より選ばれる1種又は2種以上を含有する、前記[2]又は[3]に記載の方向性電磁鋼板の製造方法。
<鋼素材>
本発明の製造方法における鋼素材としては、スラブの他、ブルームやビレットを使用することができる。例えば、鋼スラブは、公知の製造方法によって製造されたものを用いることができる。鋼素材の製造方法としては、例えば製鋼-連続鋳造、造塊-分塊圧延法等が挙げられる。製鋼においては、転炉や電気炉等で得た溶鋼を真空脱ガス等の二次精錬を経て所望の成分組成とすることができる。
Cは、微細カーバイドを析出させることで、一次再結晶集合組織を改善するのに寄与する元素である。0.10%超では、脱炭焼鈍により、磁気時効の起こらない0.0050%以下に低減することが困難になる、おそれがある。一方、0.01%未満では、微細カーバイドの析出量が不足し、集合組織改善効果が不十分になる、おそれがある。そのため、C含有量は0.01~0.10%とすることが好ましい。より好ましくは0.01~0.08%である。
Siは、鋼の電気抵抗を高め、鉄損を改善するのに有効な元素である。Siの含有量が4.5%超では、加工性が著しく低下するため、圧延して製造することが困難になる、おそれがある。一方、2.0%未満では、十分な鉄損低減効果が得難くなる、おそれがある。そのため、Si含有量は2.0~4.5%とすることが好ましい。より好ましくは、2.5~4.5%である。
Mnは、熱間加工性を改善するために必要な元素である。Mn含有量が0.50%超では、一次再結晶集合組織が劣化し、Goss方位が高度に集積した二次再結晶粒を得るのが困難になる、おそれがある。一方、0.01%未満では、十分な熱延加工性を得るのが困難になる、おそれがある。そのため、Mn含有量は0.01~0.50%とすることが好ましい。より好ましくは0.03~0.50%である。
鋼素材の成分組成における上記した成分以外の残部は、Fe及び不可避的不純物である。
本発明の製造方法は、例えば鋼スラブを、熱間圧延して熱延板とする。鋼スラブは、加熱してから熱間圧延に供することができる。その際の加熱温度は、熱間圧延性を確保する観点から1050℃程度以上とするのが好ましい。加熱温度の上限は特に限定されないが、1450℃超の温度は、鋼の融点に近く、スラブの形状を保つのが困難であるため、1450℃以下とすることが好ましい。
それ以外の熱間圧延条件は特に限定されず、公知の条件を適用することができる。
Claims (5)
- 質量%で、
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100~0.0400%、
S及びSeのいずれか1種又は2種の合計:0.01~0.05%、ならびに
N:0.0050~0.0120%
を含有し、残部がFe及び不可避的不純物の成分組成を有する鋼素材を熱間圧延して熱延鋼板とし、前記熱延鋼板に1回又は中間焼鈍を挟む2回以上の冷間圧延を施して最終板厚を有する冷延板とし、次いで前記冷延板に脱炭焼鈍を施したのち二次再結晶焼鈍を施す、方向性電磁鋼板の製造方法であって、
前記1回又は2回以上の冷間圧延のうち、前記1回の場合は当該冷間圧延及び前記2回以上の場合は最終回の冷間圧延を最終冷延と定義し、前記最終冷延の直前に行う焼鈍を最終冷延前焼鈍と定義したとき、
前記最終冷延前焼鈍は、800℃以下350℃以上の温度域における平均冷却速度を20℃/s以上として行い、前記最終冷延は、タンデム圧延機を用いて、鋼板を70℃以上200℃以下の温度域に加熱した後10秒以内に60℃以下に冷却してから、前記タンデム圧延機の1パス目に導入する、方向性電磁鋼板の製造方法。 - 質量%で、
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100%未満、
S:0.0070%以下、
Se:0.0070%以下及び
N:0.0050%以下
を含有し、残部がFe及び不可避的不純物の成分組成を有する鋼素材を熱間圧延して熱延鋼板とし、前記熱延鋼板に1回又は中間焼鈍を挟む2回以上の冷間圧延を施して最終板厚を有する冷延板とし、次いで前記冷延板に脱炭焼鈍を施したのち二次再結晶焼鈍を施す、方向性電磁鋼板の製造方法であって、
前記1回又は2回以上の冷間圧延のうち、前記1回の場合は当該冷間圧延及び前記2回以上の場合は最終回の冷間圧延を最終冷延と定義し、前記最終冷延の直前に行う焼鈍を最終冷延前焼鈍と定義したとき、
前記最終冷延前焼鈍は、800℃以下350℃以上の温度域における平均冷却速度を20℃/s以上として行い、前記最終冷延は、タンデム圧延機を用いて、鋼板を70℃以上200℃以下の温度域に加熱した後10秒以内に60℃以下に冷却してから、前記タンデム圧延機の1パス目に導入する、方向性電磁鋼板の製造方法。 - 前記鋼素材は、さらに、質量%で、
Sb:0.005~0.500%、
Cu:0.01~1.50%、
P:0.005~0.500%、
Cr:0.01~1.50%、
Ni:0.005~1.500%、
Sn:0.01~0.50%、
Nb:0.0005~0.0100%、
Mo:0.01~0.50%、
B:0.0010~0.0070%及び
Bi:0.0005~0.0500%
からなる群より選ばれる1種又は2種以上を含有する、請求項1又は2に記載の方向性電磁鋼板の製造方法。 - 請求項1又は2に記載の方向性電磁鋼板の製造方法に適用される方向性電磁鋼板製造用圧延設備であって、方向性電磁鋼板の製造ライン上に配置したタンデム圧延機と、前記タンデム圧延機の第1スタンドの入側にて前記製造ラインの上流側から順に配置した加熱装置及び冷却装置と、を有する、方向性電磁鋼板製造用圧延設備。
- 請求項3に記載の方向性電磁鋼板の製造方法に適用される方向性電磁鋼板製造用圧延設備であって、方向性電磁鋼板の製造ライン上に配置したタンデム圧延機と、前記タンデム圧延機の第1スタンドの入側にて前記製造ラインの上流側から順に配置した加熱装置及び冷却装置と、を有する、方向性電磁鋼板製造用圧延設備。
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| JPS6115919A (ja) * | 1984-06-29 | 1986-01-24 | Kawasaki Steel Corp | けい素鋼板の冷間圧延方法 |
| EP0426869B1 (en) * | 1989-05-08 | 1998-08-12 | Kawasaki Steel Corporation | Process for manufacturing unidirectional silicon steel sheet excellent in magnetic properties |
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